I've income transaction, not confirmed yet, how many confirmation I need get before spend it?
You don't need any confirmations to spend a transaction to somewhere else. Some wallets will not let you do this but some will. The Bitcoin network doesn't require confirmations to spend coins. However, transactions made based on previous transactions which haven't confirmed will also not be able to confirm.
If you want to know how many confirmations you need before considering the coins safely yours the more the better, but 6 is safe under most circumstances and always get at least 1.